Can some of you explain about ordinary cell, far-developed cell and full-developed cell?? They aren't written in m textbook..oh yes, talking about nerve, I ever read 'actually nucleus word in the nerve cell is onl for symbolizing something inside the nissl body' is that true?

Q: Why are chemists great for solving problems?
A: They have all the solutions.

You know that the origin of all body cells are mesenchyme (stem cells). This will differentiate to become another cell types. The simple cell type for instance epithelial cells; this type is highly proliferative. More complicated one for example chondrocytes. They also proliferative and can differentiate to become osteocytes. Here you see, osteocytes are far-developed, their proliferation capacity is decreasing. Full-developed cell for instance RBCs and neurons as I told you before.

There is a nice article about stem cells in National Geographic July. Have you get it?

About nucleus vs. Nissl Body... As a cell, neuron has its real nucleus to coordinate its function, that's vital. Nissl Body or Nissl substance, are really just large clumps of rough ER that are clearly visible with a light microscope. Their presence indicates that neurons are major league protein factories. This is common for cells which are secretory cells.